Sometimes it's very difficult to deal with tiny parts, especially when they are spheric-shaped. There's a very effective gadget to help this, it's called "Alloy 70" and it is a metal which melts at 70 °C. I've poured it into a shaving-foam cap:

... and held this into boiling water, after 5 - 7 minutes it's getting liquid. Take out of the water and put the tiny parts into the molten metal:

The metal does not stick to plastics or anything else and can easily took off the cap:

The parts can now be tooled easily as they are held irremovable:

When you're ready, repeat the first step, put the cap with all the stuff in boiling water againg, and as soon as it melts, take off the parts with tweezers. Should there be any remainings of the Alloy70, they normally can be removed with a toothpick or a brush, otherwise just hold the parts in boiling water, the metal simply drops off and when the water has cooled down, you can collect the metal drops from the pot base (the material is - unfortunately - quite expensive, € 13,50 for 100g).